Chasing bugs can be a tedious task, and multi-threaded software doesnt make it any easier. Threads will be scheduled at different times, instructions will not have deterministic results, and in order for one to reproduce a particular issue, it might require the exact same threads, doing the exact same work, at the exact same time. [&]

https://www.percona.com/blog/2021/04/12/replay-the-execution-of-mysql-with-rr-record-and-replay/